Improvement in dental mallets



JULIUS .A. BIDWELIJ, OF CHICAGO, ILLINOIS.

Letters Patent No. 103,706, dated May 31, 1870.

IMPROVEMENT IN DENTAL` MALLETS.

The'Schedule referred to in these Lettera Patent and making part of the same.

To all whom it 'may concern Be it known that I, J ULIUS A. BrDwnLL, of Chicago, in the county of Cook, and State of Illinois, have invented a new and useful Dental-Mallet; and I .do hereby declare the following to be a full, clear, and exact description thereof', which will enabley others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawing forming part of this specification.

Figure l is a perspective view of my improved mallet;

Figure 2 is an end view 5 and Figure 3, a longitudinal section of the same, in the line a' sr, tig. 2.

Similar letters of reference indicate corresponding parts inthe several'gures of the drawing.

In filling decayed or injured teeth with gold it is necessary that the latter be -thoroughly condensed within the teeth, and for this purpose a. mallet is employed, the blows oi' which are delivered upon an instrument called a plugger, bearing with one end against the filling.

Mallets of wood and hard'metal have been employed for this purpose, but the former does not possess sulcient weight to be eective in a tool of the required size, while the blows of the latter are too violent and jarring upon the teeth, and are colisequentlynot only liable to loosen the same, but are unpleasant and painful to the patient.

" The jarring of the tooth is dueto the recoil of the blows incident to the percussion 'of two unyielding substances; that isto say, the contact of thehard metal mallet with the |pluggen To overcome this diculty, mallets have been formed of tin, lead, and Aother soft metals, by which a yielding blow is given upon the plugger, and the recoil avoided or deadened but, owing to the softness of the metal, the mallet in a very short time becomes broken and misshapen to such an extent as to render it worthless, and the substitution of a new one necessary.

My invention has vfor its object to provide a mallet of soft metal, which shall. in use retain its form and remain unbroken; and to this end It consists in constructing the mallet of a hard metal shell llled with soft metal, as will be 'hereinafter more fully described.

In the accompanying drawing- A is the mallet, composed ot' a hard metalshell or cylinder, B, opened at both ends, and having a soft metal lling or core, C. I I

D is the handle, adapted for attachment to the mallet by a screw-connection E, or by other suitable means.

It will be seen that the ends ot' the soft metal are exposed for contact with the plugger, and Aalso that they are prevented from being forced out of shape by the surrounding ends of the hard metal shell B.

Vhen thc illing C becomes worn .it' can be easily removed, and the shell refilled.

If desired, hard rubber may be used for instead of metal.

Having thus described m 1 invention,

IVhat I claim -as new, and desire to secure by Letters Patent, is-

the shell A dental mallet, 'composed of an open-ended cylin-l der or shell of hard metal or other hard material, inclosing a soft metal core or filling, and provided with a suitable handle, substantially as described, for the purpose specified.

JULIUS A. BIDWELL.

Witnesses:

G. H. FROST,1 WM. C. FARWELL. 

